20603606 has 4 divisors (see below), whose sum is σ = 30905412. Its totient is φ = 10301802.

The previous prime is 20603603. The next prime is 20603621. The reversal of 20603606 is 60630602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20603603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5150900 + ... + 5150903.

It is an arithmetic number, because the mean of its divisors is an integer number (7726353).

Almost surely, 2^20603606 is an apocalyptic number.

20603606 is a deficient number, since it is larger than the sum of its proper divisors (10301806).

20603606 is a wasteful number, since it uses less digits than its factorization.

20603606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10301805.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20603606 is about 4539.1195181445. The cubic root of 20603606 is about 274.1454730381.

The spelling of 20603606 in words is "twenty million, six hundred three thousand, six hundred six".